pub const ALPHABETS: [char; 26] = [
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',
't', 'u', 'v', 'w', 'x', 'y', 'z',
];
pub const DIRE: [(isize, isize); 4] = [(1, 0), (0, 1), (-1, 0), (0, -1)];
pub const DIRE8: [(isize, isize); 8] = [
(1, 0),
(1, 1),
(0, 1),
(-1, 1),
(-1, 0),
(-1, -1),
(0, -1),
(1, -1),
];